How many rods, each of length 3.5 m and diameter 4 cm can be made out of 1.76 cubic meter of iron?
A. 400
B. 800
C. 576
D. 1600
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Length of the rod = 3.5 m
Diameter = 4 cm = 0.04 m.
Radius = 0.04/2 = 0.02 cm.
Basically, rods are cylindrical in the shape.
So,
Volume of cylinder,
= pi * r * r * length
= 3.14 * 0.02 * 0.02 * 3.5
= 0.004396 cu m.
Now, no. of the rod can be made from iron,
= 1.76/0.004396
= 400 rods.